I have searched and searched for any other footage taken on 9/12 and 9/13. It does not appear that any news stations actually broadcasted live outside the home before the 6 p.m. broadcast by Fox 13. I did find an additional video from WFLA that included an interview with a neighbor, but the live broadcast was an evening broadcast and not in front of the home so the time in the bottom of the screen doesn't reflect the time they actually spoke with the neighbor, which was during daylight hours.
So what we know as of right now for the 13th is:
There are pictures from the Daily Mail of CL mowing his lawn (ridiculous I know, but they do show the driveway sans Mustang) and we can assume it was before 3 p.m.
There is video footage from Fox 13 and WFLA's evening broadcasts on 9/13 that show clips of interviews with neighbors that I can only assume were taken earlier in the day on the 13th since it is clearly daylight outside.
The Fox 13 interview of the neighbor shows footage of the Laundrie home and there's standing water at the end of the driveway, so I assume that's post-rain.
WFLA's clip is from their 11 p.m. broadcast and also shows wet roads, so I'm assuming that's post-rain too. However, there's also no Mustang shown in the recording.
Without a way to verify the actual interview time, it doesn't help to narrow down the window any more than what we already have, which is the Mustang was definitely gone before 4 p.m., which is when the Daily Mail article was published with the photos of CL working in his yard. I think it's also safe to narrow that down even more when we take into consideration that articles aren't published as soon as the photo is taken and that it was reported to be 91 degrees at noon in North Port on the 13th, but without any solid evidence on the time the photos were taken, I guess we just leave it at 4 p.m.
We know the park is open from 6 a.m. to sunset.
We know it rained off and on from about 3:00 p.m. to about 7:15 p.m.
We know that the Dodge truck was in the driveway as of the Fox 13 6 p.m. broadcast and had been moved before the 10 p.m. broadcast. One would assume that's when CL went to search for BL, but I suppose he could have went after 10 p.m.
I have not been able to find anything at all, yet, for September 12th.