I would say a racoon. They get into everything and chatter quite a bit. He was probably having a good old time!

I think its a prarie dog...it the little critters that dig holes in/under your lawn but look like chipmunks. I'm almost positive thats what it is because I have one that digs holes all over my yard and chirps like a bird whenever im near (Im pretty sure this is to notify its family/friends). They will definitely get into stuff as I'll always catch it trying to climb up my eavestrough or going through my garage. I've never heard a raccon chirp or trill and I think a raccoon would be able to muscle its way out of a garbage bin just IMO...

Here's a link to some raccoon sounds(scroll down the page), maybe something will sound familiar...

Here is a link that might be useful: raccoon sounds

Yes, noinwi, it could well be a racoon. perhaps a baby one

When my neice had a guinea pig, it made some similar happy
chirps and noises.

I'm an old grannie, and think I've seen and heard it all, but am bolloxed by those sounds I heard. Remember Occams Razor, tho. Always look for the simplest answer.
So far, it hasn't returned. Thanks so much, Pondy