Reader-added tags include "Hidden item", "Mystery item positioning that often happens in video games" and "A wild bread".

Kogasa-san said:

Basically, this sort of stuff is no-good product, so best not to touch it. (^^;)

Depends on what's being dumped. Fresh produce like fruits? Of course not.

But if it were bread, i'm opening it to inspect. That's enough bread to last a week if unspoilled.

There could be no harm in slitting it so it was available for your little black friend. He looks as if he knows what to do...