Might be a slightly odd idea, but there was mention of making the skyranger and pigeon harder to get and this might help there: possible mission where you attack a salvage team or a salvage yard, or even an archeological dig, with possible rewards including scrap, piles of junk, homefront rifles(if anything can survive centuries in muck, these can) with the upper end rewards being wrecked vehicles or very rarely hulls for some of the black market ships. You could rebuild a jetbike for sale or use, with a little work and a decent workshop, maybe this could be the only way to get a skyranger or pigeon, or other aircraft more in line with our era.
I think it would make sense to have better rewards for bigger maps, raiding a small salvage yard would offer less than a major one, or attacking a small group digging out a ruined jetbike vs a big crew who found an old airfield.
Another idea is to be able to have some runts, hands and maybe a brainer or two do job where they are the ones digging up old stuff, with the chance of your dig getting raided and needing to fight off those who want your hard earned relics or just want to repress what you may have found. Probably a manufacturing project of that sort would be too complicated.
What other materials from our era do people think might be fun or useful to find?
Wow this got long