I did Chapter 5, it's not there.
No, no help please I'm looking too but still haven't found any ants hanging off foliage etc.
There is still a lot of bug spray in places and it is on the locksmiths desk when young Sully gets the cabinet key cut but don't think that's it.
Keep looking fadster! Oh and where's my cool sig?
Oh yeah! I totally forgot about your sig... Sorry! But I don't think I'll be able to make you one soon .
Anyways, I found a non-TLOU related easter egg (or bug, can't tell what it is).
In chapter 6 in the chendelier room, on the platform where you help Sully push the log from the top. There's a mini chandelier hung from that platform you would be standing on. drop on the ledge closest to the mini-chandelier, and Drake keeps kicking it away .