I just remembered that the replacement stickers may have been part of an upgrade program.
IIRC, there was an Apple program where an older pizza-box LC could have its logic board replaced with a newer model (the LC/Performa 475). Then, a sticker would be attached to the case to reflect the machine's new status. I don't know all of the details (such as, could a user do the replacement or was it done at an Apple service centre?), but I'm pretty sure that that explains the odd stickers, kind of like a less-expensive version of the original-Mac-to-Plus conversion. I don't think this upgrade path was quite as common, though; it was probably cheaper or the same price to just buy a new LC 475 than it would be to replace the logic board in an older one, and install a new hard drive (>40MB) and OS to match.
As for "professional-looking", many machines I've seen coming out of an Apple service centre have had things done to them that were definitely not professional, such as missing/stripped screws, incorrect parts (wrong processor speed, for example) or missing stuff (such as customer-installed RAM), or significant cosmetic damage.
IIRC, there was an Apple program where an older pizza-box LC could have its logic board replaced with a newer model (the LC/Performa 475). Then, a sticker would be attached to the case to reflect the machine's new status. I don't know all of the details (such as, could a user do the replacement or was it done at an Apple service centre?), but I'm pretty sure that that explains the odd stickers, kind of like a less-expensive version of the original-Mac-to-Plus conversion. I don't think this upgrade path was quite as common, though; it was probably cheaper or the same price to just buy a new LC 475 than it would be to replace the logic board in an older one, and install a new hard drive (>40MB) and OS to match.
As for "professional-looking", many machines I've seen coming out of an Apple service centre have had things done to them that were definitely not professional, such as missing/stripped screws, incorrect parts (wrong processor speed, for example) or missing stuff (such as customer-installed RAM), or significant cosmetic damage.