I don't know that early serial numbers equate to value added, but someone might weigh in here...
Bolers aren't like 1920's Gibson mandolins or anything.
"Value" also includes utility in the case of Bolers. It may be old, but is the frame cracked? Is it swamped in mildew? Is it one with a rotten plywood floor? It seems that utility is a benchmark. The more usable it is, right out of the box, the more it's going to be "worth". Sure, there's the "cult value" in an old flat-top egg, or one with a very low serial number (like 001) but: meh. It's just a camper, after all.
Having said that, I won't part with mine any time soon.