Thank you, GF
And yes, it's a lithium "coin" battery. And that's what they said as well, it has to be removed within 2-3 hours or it's too late. So, of course, I panicked lol.
DD and Hazel, it's not in the cushions. I thought maybe it had fallen into the couch itself, so Shaun and I flipped it over, but no luck. I'm off tomorrow, so I'm going to literally turn the house inside out
I'm really hoping and
'ing I'll find it. I'm also going to scour the back yard.