Routing slips
Routing slips were meant to be temporary, which is why they survive oddly. They hide in file folders, stuck under staples or folded around the top edge of a packet.
Internal routing, yellow
5.5 x 8.5 in. Canary stock. The checkbox column leaves enough room for a finger crease along the left edge.
Route line version
The second and third route lines are usually where initials crowd into the margin.
Attachment slip
"Hold pending attachment" appears on more forms than people expect. Attachments went missing often enough to print the instruction.
Handling notes
Small slips tend to show staple rust and torn corners before the larger form does. If a route slip has two sets of staple holes, it probably moved between packets.
The paper color matters. Yellow slips were easy to find inside manila folders, but a weak scan turns canary stock into muddy gray unless the scanner profile is corrected.