Turning it over to an attorney does not mena lawsuit - there are lawyer/collectors that just because the have JD affer their name can intimidate people into paying.
This is not to say that they may not be thinking a lawsuit - you just don't need to flip-out because of the word attorney. If they do send to a collector attorney you DV the attorney. If for a lawsuit - you DV the CA and cc that attorney. This won't save you from the SOL not having expired but it may buy you some time to manuever. On the other hand - they might not be able to validate.