ok so I've hit the deadline on this ask.
I got it in late 2021 and I have no idea who I got it from. I didn't write the artist name down in the filename, mistake on my part. I don't remember the name at all.
I'm pretty sure I contacted them on twitter during my short time there, in which case all of that message history is long gone.
I know two friends that also got art from the same artist. Neither remembers who. One thinks their handle changed at some point.
I did find the invoice, which just gives me a legal name and some handles that don't look familiar. I sent the email an invoice asking and... no response. So I'm out of ideas.
If I find out I'll pop a note in a pinned post of yours or something. Their work is really good and they deserve more people knowing about it.