People in crypto have this bizarre fantasy of the IRS as a place where they still keep everything in paper files.
The IRS processes more tax returns every year than the entire EU combined. It switched to digital files a long time ago. If you file your return by paper, it gets scanned into a digital copy and the original gets carted off to a warehouse somewhere in the mid-West. If you get audited, the auditor is looking at a digital copy of your file. If they are looking at a paper copy, it is because they printed that copy out for personal convenience.
If you send the IRS 20 kilos of papers, the people who they hire seasonally will process your 20 kilos of papers and an automated system will scan and convert each and every page. Though generally, if your tax return would exceed a certain length, you are now required to file electronically and any supporting attachments are to be kept on file so they can be requested by the IRS as necessary.
(On a somewhat bizarre note, the tax court requires paper copies of all filings and documents, though in some circuits the tax court now allows discovery to be satisfied through the provisioning of digital copies.)