Argh. I can feel this one.

My party often gravitates to the grossest random ad-hoc detail.

“I’m pretty sure that dead animal carcass is magical. I stuff it in my bag.”

… Much later …

“I dump the dead carcass on the Wizards desk and ask him to cast ‘detect magic’”.

…party proceeds to remind me (the DM) that they’ve carried a dead animal carcass in a backpack for half the campaign…