Reply #5: Update on the update:

[trof]

2 disappeared yesterday, leaving 3.
Two of those appeared to be lethargic all day.
My daughter tried calling various animal rescue organizations to no avail.
EX: "We do birds, not mammals."

I tried feeding them milk soaked bread, as had been suggested here.
One kind of took to it; the other didn't care.
I put them in a ventilated shoe box (with a paper towel mattress and the bowl of milk bread) in the garage.
They didn't survive the night.

I saw Grunty, the original one and the one I 'befriended', yesterday evening.
He hopped on my shoe and I picked him up.
He purred again.
Haven't seen him since.

For the last two days he's been living under the siding of the house next to the back steps, but I don't think he's there any more.
I 'knocked' and nobody home.
Maybe he made it somewhere.