We found an entry in Thomas' Register under Time Capsules when we had
this question some years ago.

On Thu, 30 Jan 1997, Doug Kendall wrote:

> A local patron is looking for a time capsule to fill and bury as part of
> a town sesquicentennial celebration.  I don't find sources in our
> reference works and seem to recall this question coming up on the list a
> while back.
>
> I would appreciate any information on sources for time capsules that list
> members could provide (by private email unless you think it's something
> many will be interested).
>
> Thanks!
> --
> Doug Kendall, Curator of Domestic Life
> State Historical Society of Wisconsin, Museum Division
> 816 State St., Madison WI 53706; (608)-264-6552
> e-mail: [log in to unmask]
>