Text messages, unlike email do not use servers based on some experts Hannity had on his show today.
If they still exist, the NSA may have them. The cell company may have them
and less likely Strzok and Page’s phones may still have them.
However, they have most likely been wiped from Strzok and Page’s
phones.
It’s also possible for anyone to delete their eMails off their computer/server.
I agree with that.
Hopefully there is a trail that can be utilized to recover the ones attempted to be destroyed.
Depends upon the protocol being used for the text messages. Many, if not most large corps now have policies in place that automatically archive everything. Of course, the government wouldn't use such a system, because then there might somehow be some actual accountability.