Ag_F150

I'm looking at ads for trucks, want to upgrade from my f150 to a superduty. I came across a truck that caught my interest-05 supecab. Ad says "rear doors have not been opened for 6-7 yrs and are stuck shut". Is this a known problem with this truck? I have not done anything more than just look at the ad, don't want to waste a bunch of time if it is a real nightmare issue.

Thanks