No doubt I would taken the kitty with me.
A declawed cat wandering the streets, abandoned or lost needs protection
I would certanly ask around the neighboorhood, but
have you seen any sing of "LOST CAT"? ,you know what I mean.
The mats in his fur denote his is not "out" for a little while. Meantime has he got food?
If you decide take him with you, you have not stolen him, you FOUND him with no sign of property. And + hi definitely loves you!