The question is, is there an easy way to systematically search for such boxels in existing data?
Like search for GGs with low Helium content? Search for ELWs in such a boxel?
Along with that it would help to be able to search for all the systems of a boxel that are already in the database.
Like I am right now in IOCKOLS OX-S D4 and found 20 ELWs in ~550 jumps (24.9-25.1% He in the few GGs I found). Most but not all systems I visited were inside that boxel. I can check my travel log on EDSM, but I have not yet figured out an easy way for a general search on EDSM/EDDB/INARA/SPANSH to search for the known systems in a boxel, the ELWs in a boxel, the GGs and their Helium content. I guess I could try and work with the EDASTRO spreadsheets, but that might be rather cumbersome and it's not relative to a location or such...
There is no easy search for this highly specific scenario, so EDAstro's spreadsheets are the answer here, yes: you need the metallicity spreadsheet, the ELW one, and optionally the systems dump from EDSM. I'm saying "optionally" because if you don't mind that the data is from July, you could grab the processed data from
this thread I made at that time. That's the galaxy on a sector level though, not a boxel level. However, you could use it to pick some sectors you like (since you can check the numbers of ELWs and systems uploaded) and check the boxels in there. For my research in
this thread, I did just that, on Eol Prou and Eoch Flyuae.
That said, personally I'd restrict such a search to the galactic core, since I assume you're looking for undiscovered stuff, and any boxel outside the galactic core that has enough systems to get a good read on will already have been fully surveyed. Only in the core can you find boxels which have hundreds of systems uploaded already, but thousands not yet explored.