Terrified Foster Won’t Eat

I’m a first time cat foster (previous dog foster) and I could desperately use some advice.

We picked Henri up Monday so he’s been with us about 4 days now.

Pertinent information: Henri is 6 years old, he was surrendered to the shelter last month after his owners died. From what we know he was the wife’s cat, she died several years ago, the husband sort of coexisted with him feeding him table scraps. Husband died in February leading to the surrender of Henri and four other cats. He’s the last to be adopted.

In the shelter he was extremely shut down. Would not eat and was being syringe fed. When we met him he did not hiss, let us pet and love on him, which probably gave me more confidence than it should have.

Now we’re four days in and still syringe feeding.

What we’ve tried:

\- churu (no interest)

\- stinky wet food he was eating at the shelter (no interest)

\- Turkey

\- cheese

\- yogurt

\- hot dog

\- tuna

He’s locked in a bathroom that gets some foot traffic and honestly is pretty amiable to getting pets to the point that he was getting belly rubs.

What have I not thought of?