can i get a new macbook air if mine was stolen?

Well yeah but it probably won’t be free. It would technically not be Apple’s fault so they would have no reason to give you another one for free, unless you have Apple Care.

If you want to try finding your lost MacBook, you can do it from the Find My app, if by any chance it’s still opened and linked to your Apple ID with Bluetooth turned on…

Did you have Insurance on your MacBook Air with theft coverage?

Axel F.