If by Pre-samples you meant fully automatic weapons, then no, if you let the SOT expire you can keep all the NFA stuff, except for machine guns.
What happens if I let my SOT expire?
Nothing. All NFA items in your possession are yours to keep and sell except for full-auto firearms. If you let your SOT expire and have a full-auto you must let the ATF know so they can pick up the full-auto firearm and dispose of it. Failure to report is a felony that the ATF does not joke around about (when they typically are good with FFLs so long as you contact them).
Suppressors, SBRs, SBS, etc can be sold to standard customers on the standard Form 4.
The exception to this is if the FFL company also closes. All assets of the company would have to be transferred out, even for single-member LLCs or single-owner Corporations. However, a FFL under an individual’s name is able to keep all the assets without paying the transfer tax as they were transferred to them personally in the eyes of the government.