Personally I don't find it odd that this was discussed with a grief councillor, a grief councillor would be discussing many aspects of the child's life with them. We also know from the warrants that you linked that they did not find a bat, the only warrant which requested a search for the bat was the one issued and executed on 4th December 2015 of the property at Panthers Ck.
All warrants, bar two were for telephone & cell phone positioning records, searches of computers, social media searches & bank records. The main reasons for these searches was based on the testimony of the officers at the scene of the crime & the bank ones are also focused on information provided by the attorney dealing with the estate. The other two were from the locker at the Golf Club and for the Residence & Garage. The locker at the Golf Club was mainly based on LE learning he was a member of the club, something I do not suspect they even needed to get from any family member. The only one really that has much content about information provided by the family is the one regarding the search of the home.
Warrants for 1) Facebook Inc, 2) Google Inc
Brief of Affidavit given rise to Search Warrants
During the investigation it has been discovered that the Martens Family sudden change of plans on Saturday August 1[SUP]st[/SUP] 2015 to travel to North Carolina from their home in Knoxville TN. According to information received this behaviour would be considered unusual for Mr Martens.
Note on here it does not state unusual for the Martens it states Mr Martens.
All other details in the Affidavit are details about the facts in the case such as the officer stating that the scene did not match the story given, no injuries found on MM or TM, JC died as a result, TM & SM were visiting, TM saying he was woken by a disturbance.
Affidavits was signed on 3[SUP]rd[/SUP] September 2015 and executed on 4[SUP]th[/SUP] September 2015
Warrants for 1) Bank of America, 2) PNC Bank
Brief of Affidavit given rise to Search Warrants
The Affidavit mainly speaks of the incident that occurred and then it extends to the family of JC having stated that JC had expressed a wish to return to Ireland and also from his employer stating that JC had discussed transferring $60,000 back to Ireland. However, this Affidavit also state that LE had learned from attorneys handling JCs estate that since JCs death, large sums of money had been removed from accounts held jointly by JC & MM.
Affidavits was signed on 16[SUP]th[/SUP] September 2015 and executed on 17[SUP]th[/SUP] September 2015
Warrant - Dell Laptop
This Affidavit mainly speaks of the incident that occurred, scene did not match what was described, no injuries on either TM or MM, behaviour of the Martens visiting was unusual of Mr Martens (as it does in FB warrant). It states that Mr Corbett had been planning a trip to Ireland at the end of August and also that information had developed that JC had expressed a wish of not inviting MM to join him and that he & children were no returning to the US.
Affidavit signed & warrant executed 3[SUP]rd[/SUP] September 2015
Warrant for the search of Property & separate garage at 160 Panthers Creek
The Affidavit with this warrant is more extensive for all the other, it describes the incident but focuses on the baseball bat. It confirm what LE were told by MM & TM, particulary that TM stated that he brough the bat with him when he was visiting but had failed to give this to the child. It describes the bat taken by LE at the scene as aluminium with Black & Red in colour with black grips and describes wet & dry blood on it. The warrant further goes on to say that information had come to their attention which came from grief counselling that Jack Corbett was receiving in Ireland. Jack had told his grief councillor that he had received a baseball bat as a present from his stepgrandfather the previous summer. He described this bat to the grief councillor and this was described as aluminium Black & Red baseball bat with black grips. The Affidavit extend to say that LE officers had viewed photographs that MM had shared showing the child with baseball equipment.
Affidavit was signed & executed on 4[SUP]th[/SUP] December 2015
Warrants for AT&T phone records & cell positioning x 2
Warrants for Cellco phone records & cell positioning x 2
Affidavit describes the incident, what TM had said on the night, the scene not matching the account given, TM & SM were staying in the downstairs bedroom, nothing else really apart from when LE had learned on the night. Warrants for all the above include requests for call durations, cell positioning, text & other media records, etc.
Affidavit was signed & executed on 18[SUP]th[/SUP] August 2015
Warrant for Locker at Golf Club
Affidavit similar to the others describes the incident, what TM said on the night, the scene not matching the account, etc. It also adds that LE learned that JC was a member of the golf club and requested a search of the locker looking for paperwork if it existed in locker. All details of what they suggest to look for is detailed on the warrant, too numerous to type.
Affidavit was signed & executed on 18th August 2015
All the warrants can be viewed here
https://drive.google.com/file/d/0B717FUtKwdU8cEpQMURYSEpMcEU/view?pref=2&pli=1