As someone who worked with those documents all the way up to the highest level, it’s not the amount of the documents. That’s the problem it’s what level of classification may have been lying around.
For instance, I saw top-secret SCI cover pages in those documents that were found at Trump’s place you don’t want those laying around at all as matter fact I shouldn’t be anywhere, but in a skiff
To be fair in all of this, we didn’t get to see what the classification was of the documents that were in Biden’s possession you could assume that they were probably classified at near or the highest level
For instance, confidential would not be as damaging as secret