How to recover the unsaved scripts if the SSMS crashes / unsaved tab gets accidentally closed?
You may be able to find them in one of these locations (depending on the version of Windows you are using).
Windows XP
C:\Documents and Settings\YourUsername\My Documents\SQL Server Management Studio\Backup Files\
Windows Vista/7/10
%USERPROFILE%\Documents\SQL Server Management Studio\Backup Files
OR
%USERPROFILE%\AppData\Local\Temp
Googled from this source and this source.