Great looking bun.
Is he a mini-lop?
Are you going to keep him? What a sweetheart he looks so happy
What a lovely bun - do be REALLY careful about anyone claiming him especially if you have described him in the posters etc.
. Also think hard to yourself about whether their housing was good enough - even if they are his original owners - after all he escaped!
TBH if his owners haven't leafletted and posted like you have then really . . . .