"a Copy of the result of Our deliberations ... is not worth the expence of postage, or I wou'd now Enclose it to you".
Which is how my family came not to own a contemporary copy of the US Constitution, and is a nice insight into what Very Important Events can look like close up.
Tangentially, the whole page I linked to above is quite interesting on Pierce's involvement with slavery, which he probably felt obliged to justify given that Weeden's was a very much an abolitionist family. The way he tells it, he'd like nothing better than to get rid of his slaves, but they just won't go, knowing that they'd be worse off on their own. (It doesn't seem to occur to him that he could not only free them but give - or rather, pay - them some land/money so that they could be independent.) I feel a little cynical on the point, since it was Pierce Butler who introduced the Fugitive Slave Clause to the Constitution, which doesn't seem like the act of an abolitionist manqué, however keen the folks back in SC may have been on it. I wonder though whether it was a figure such as Pierce described himself as being whom Weeden's son (also Weeden) had in mind when he portrayed the "good" slave owner Wilmot in Zimao the African (1800). Sadly, none of them is around to ask.