The same thing occurred to me. But I’m shifting to a new laptop and the HD will be wiped/pulled because the old laptop is essentially garbage.
Sorry: I won’t be solving my puzzle, but it seems we made the same error.
I would make sure that whatever you get is BIOS compatible with m.2 with full NVMe as a system disk. This is where things are going.
I went the other way and found a used Inspiron 3853 dual Core with a True NVME M.2 slot and a Hard Drive. But it didn't come with an NVME drive and learned the hard way that you have to install Windows from Scratch on an NVME drive pretty much. The bigger the NVME the better, I did a 1TB NMVE M.2. Why? Bigger windows write cache.
Am now experimenting with a NUC 6 (also used) that has two True NVME M.2 Slots. And I do a lot of video processing and copying, this should be truly awesome.
8GB two 4GB identical DIMMs for Dual Memory is the lowest I would go with windows 10 for performance. This is another key for the future as NVME M.2 is Dual Channel as well. Am expecting 1GB transfer in less than a second. Or about a super transfer rate. Theoretically it could go 16GB/Second NVME to NVME, but the target needs to be 1TB or larger.
I'm thinking some GPUs are gettin sone NVME transfers directly now. It should be awesome for Gamers.