I'd suggest a squirrel. We have squirrels that dig up anything planted. The fact that something got onto a raised table is the clue you need.
Can you put out a trail cam or something?
One way to tell - plant stuff in a pot and put chicken wire over the top; weigh it down well. Put another planted pot right next to it. If your pot is tossed around, but the chicken wire pot isn't, then I'd be 99% sure it's a squirrel. Squirrels just dig, occasionally they'll eat, but they're really just looking for burying places.
