Un-permitted rooms in attic space

[Rudy Manna]

Considering buying a house which is 4/2 in MLS. However county says 2/1. There are 2 bedrooms in the attic space. However the square feet matches (both of them 2000 sq ft).

I called up county and they couldn't find any permits on the attic space bedrooms. Which means the bedrooms in the attic space most likely are not permitted. However the house has been listed as 4/2 in the MLS during the past two transactions.

What does this mean in terms of valuation? Does this mean we may have problem during selling in future. Any guidance is highly appreciated.