I'd say crated equipment would be the best to grab specifically in this context, as ideally that would somehow enclose any necessary technical documentation. Grabbing a Clan firebase's 'Techs would be great in other contexts, but the people who perform maintenance on the equipment aren't guaranteed to know how to build you a new one; might as well ask the kids at a Mechit-Lube in downtown Solaris City if they know the engineering principles behind the Banshee they're doing a coolant overhaul on. Salvaged gear is good but there's no guarantee of quality once something is exposed to a firefight. And as other people have said, an intact memory core would really be the ideal way to get every possible bit of relevant information. Especially in 3055 or so, now that I think about it, because Spheroid scientists were well aware of the extent of the technological gap and should hopefully have realized that understanding Clan materials engineering was the key to achieving mass-production (see the introductory page from Maximum Tech).