Awww, he's so cute! He must have been somebody's pet, sadly may have been an "easter bunny" that got "set free to survive in the wild" when he was no longer wanted. Sad how often that happens.

Maybe if no owner steps forward, you could list him (are we sure of gender?) on petfinder.org.

Parsley, carrot tops - no iceberg lettuce, but darker lettuce like romaine is okay ...

Could be an English Spot, mixed Rex, definitely not a Netherland Dwarf ...
cute spotty bunny!

Has Bunny been to the vet? Maybe your vet would know of someone who might want a bunny.

Do pick up a litter box but do NOT NOT NOT use cat litter in it - Carefresh is available in small packages, or even just bunches of hay for litter and munching ... a box-trained bunny is easier to find a home for, and for all we know, maybe s/he is aready used to using a box ...