How should I handle this 5747c notice?

I received a 5747 notice in the mail for my 2022 return which requires an in person appointment with the 2022/2021 return and identity documents to verify. Unfortunately, I used the desktop version of Turbotax and lost access to my original return while switching computers and failing to properly back up my files. I have my 2022 return transcript and supporting documents (1099s ect.), but not the full return. 

I haven't been able to call the number on the letter yet to set up an appointment, but I was just wondering if anybody here new how big of an issue not having the actual return would be.