Gabby Petito sleuths think Brian Laundrie wrote her last posts after spotting one of final Instagram pics was weeks old

The second picture is a shot from above of their van.

"Almost immediately after telling @bizarre_design_ how happy it made me to see that people were truly respectful of the park, I watched some guy leave his processed pre-packaged plastic conglomerate of lunch garbage on the picnic table!" the post was captioned, tagging Laundrie's account.

However, Gabby's supporters became suspicious after noting that she had already used the first picture in her highlight "Van Life" three weeks before and tagged Laundrie meaning he would have access to the photo.

The second shot of the van was also shared by Laundrie himself two weeks before and included in the same highlight.

The post also didn't have any location tag, which appeared out of character for Gabby after her previous travel posts.

"I'm just gonna point out that these last two posts do NOT have location set up. The rest of her posts do!" one user wrote.

Sleuths also took issue with the caption used in , the same day it is now known Moab Police in Utah responded to an incident between her and Laundrie.