Ho crap!
The guy you nought from is a shister.
He’s playing you.
He’s trying yo sell you something he should have included in the original deal.
Anyway, that’s your choice now.
Buy the tuner from him or pass.
As Mineral Grey said, it probably contains your stock tune, which is valuable.
His advice to check that and ensure it works with your car first is great advice.
If it does not contain your stock tune, a hard pass is advised.
Then, getting the SCT and getting Downey’s to flash you back to stock is best course.
Once you secure a stock tune, dump the SCT tune appropriate for your mods in and run that until you decide to get a custom tune, as Ohtobbad suggests.
I don’t know who Raven is, but have herd several first hand accounts about Pete in NH and would have no reservations in recommending.
Being in northern NB, I started dealing with Dasilva racing in Pickering, ON, in 2008 and all my tuning is done by them.