After signing, it proves that the other party recognizes your delivery. If the other party doesn't give money or something, they can sue, so the delivery list is the basis.
Usually QQ or WeChat chat information is best to take screenshots to retain evidence.
We have encountered such a situation before, and the unclear handwritten list caused us to lose some.
Later, I changed the bill of lading printing software of the cargo management to print the bill of lading, and I know the delivery details clearly.
It will be more perfect after the other party signs it.