I'm glad I'm not the only one with my nose in a book, checking this out, Melanie.
The short answer to this, Lee, is that according to Hamilton Smith' print, made a little over a year after the event (There are many of his plates in
Wellington's Army with commentary by P.J. Haythornthwaite. Masterson is Pl. 35), the haversack bore an oval brass badge with the Prince of Wales's three feathers rising out of the badge and overflowing the top of the emblem. Presumably, the number ""87" was in the middle of the badge, but it can't be read in the print. It was centrally place and a little under 1/3 of the height of the haversack. The pouch was unadorned.
The problem is, though, as Haythorthwaite points out at length, Hamilton Smith painted him in the new uniform of 1812. I don't know, though, of any changes in the regimental emblems in 1812, so this is probably a safe bet. This sounds like a good figure. Who made it, and is it still available?