Your friend’s house would not have been bought from Sears in the 50s because they stopped manufacturing them earlier. My house arrived on the train with all its numbered pieces, in 1922, and is still one of the strongest houses around. We have many in our area west of Chicago, a real tribute to their forward thinking of that time.
My wife and I are still the owners of the house she grew up in. Wasn’t built by Sears, but in 1954 her Dad had a Sears ‘LifeTime” roof installed. Looks almost like shingles but it is actually aluminum plates about a quarter inch thick - and it still doesn’t leak!
A relative lives in it now. I told the wife this morning, “damm, if they go bankrupt I guess there goes the LifeTime warranty on the roof. I’m sure your Dad expected to get more than 65 years out of it!”