Swag are promotional items usually given away at trade shows, events or as gifts to customers. When the customers have big money to spend, on things like high-end computer equipment, the swag can be quite extravagant:
CRAY sunglasses
RayBan sunglasses with CRAY logo.

SGI "ice" cube
A plastic ice cube with SGI logo. It lights up when it gets in contact with a liquid.

SGI reseller plaque
SGI resellers most likely had these in their sales offices to signify that they were authorized. It's a heavy piece with a brushed metal backing and an engraved glass front.

IBM Charlie Chaplin pin
IBM advertized the first PC with a Charlie Chaplin lookalike discovering the IBM 5150. This pin shows a snapshot of the TV commercial.