You understand that anything can be declared a Presidential record, right? Even doodles on pieces of paper. Boxes being removed means nothing until we see what evidence they have to get a warrant for the raid, and if there was anything to back it up.
However, it seems like another "whistleblower" is helping the DOJ and Democrats once again. So, we all wait for this "evidence" to come forth.
Trump should have just kept everything digital, hosted them on his own server and then used a hammer and BleachBit to destroy everything when requested to hand it over. Then he would have got off scott free.