My mom totaled the car they need the title for the insurance company. They cannot find the "box" with all their important papers in it. My dad has early stages Alzheimer's and when we asked him about it he says "I threw it all away". Where are good hiding spots that Alzheimer patients use? What do we do if we can't find the title? the Wills? the POA? Marriage License? Birth Certificates, etc?
If you need the title quickly, I'd get a duplicate from the Department of Motor Vehicles. They charge a hefty fee in my state, but, it's worth it, if it's going to take many hours to locate. I would continue to try to find the other items though, because if you need them later, you'll have to pay a lot to get copies.
And, I would look at mom's driving. Is she okay to drive?
Also, I would start to prepare to get all new Power of Attorney, Wills, etc. ASAP. Is dad still competent to sign them?
Might they have a safe deposit box? My parents kept papers in shoe boxes in the attic... a bedroom drawer? top closet shelf? in a suitcase?
Each family has their own clever hiding spots, when I was moving my mom I found a forgotten wad of cash hidden in the studs in an unfinished corner of her bedroom closet. If things can not be found you will have to go through the process of replacing them, just as people must who have had a fire or flood, laborious but doable.