Olivetti d-Copia 3001MF Operation Manual page 383

Adding Staples
The paper sizes are marked on the finisher tray
extension. Open ejected paper guides 1 and 2 as
necessary to match the paper size.
When stapling Legal, Statement, A3 or B4 paper, open
the finisher tray extension to ensure that the paper does
not fall out of the tray.
1
Pull to open the stapler front cover.
2
Pull out the staple holder.
Appendix-5