Stealing Pots From a Church (Building) on Accident

Many years ago I borrowed two large (really large) pots from a church that I used to go to for a group that I used to belong to.  Its been so long that I don't even remember the exact event.  These pots have been in the trunk of my car for at least a year or two.  I don't know what to do.  I feel a little bit like I'm stealing if I don't return those giant pots.  But, since I haven't been to that particular church in a long time, and since all my friends who used to go there are gone, I can't think of some non-weird/awkward way to get those pots back into the church.

Sometimes (not often) I smoke cigarettes.  I go though, maybe, two packs a year.  Awhile back I started storing the butts from those cigarettes in the forbidden pots in my trunk.  The pots are so massive that the butts haven't even covered the bottom.  But if I keep this car and those pots and if I keep smoking two packs a year, maybe one day those pots will be full of cigarette butts.