The kind of party that is not a party is the same kind of Twisty Word Game WH seems to like to play when giving other details, it would appear.
The question about allegedly claiming to have overheard AJ talking to the mom of her BF about the GoPro brings up A LOT of new questions since...
1. AJ was at school all week, the week "prior" as WH claims (that he heard the conversation - oh - and also gave her $100 that she didn't ask for, because she never does that)
2. If it happened on the prior weekend she was home, he would have had to be there
3. It would appear based on what we know now, he likely was not there
4. Things were already strained prior to that Monday she went missing but we don't really know when he actually started staying elsewhere
The BF's mom could clear this up in a heartbeat, but she's not here.