Biden was told by the “justice” department that they were going to search his house. Biden refused and told them to go get a warrant. The DOJ said, “OK, we will.”
Biden (his minions, actually) quickly realized what a total PR nightmare that would be, so Biden agreed to the search. He was “cooperating” because his arm was being twisted–hard!
So don’t be bamboozled into thinking that Biden was somehow cooperative. He wasn’t. He simply realized or was convinced by his minions that he would get better press by conceding. The End.
Oh, and Trump was never given the same option…