If indoor cat only...
Your indoor cat is hiding in silence very close by!
This link/article gives excellent advice for lost indoor cats...Hiding in silence and fear in survival mode very close by. (tips from Friends of Buddy lost cat and trapping rescue, Manchester, CT)
Please read!
https://www.facebook.com/263531321039472/posts/297810040944933
All good advice. Our cat was lost twice, and we did all those things each time. Nala is probably very close to your home. What worked both times for us was putting out a have-a-heart trap by our door, with some food, water, and one of my sweaty t-shirts in it. The animal shelters probably have a trap you can borrow.