I use Obsidian for note-taking, but Evernote for my "digital shoebox" of receipts, PDFs, photos of wine labels, insurance statements, etc. They are all quickly findable through a combination of OCR and tags.

Does anyone have a good alternative for this use-case?

If you're willing to self-host, I've found Paperless to be quite good:

https://github.com/paperless-ngx/paperless-ngx