Weapons card

The weapons card is an Easter Egg in Halo 3: ODST. It is a white card with black print of several unknown Covenant weapons on it.

Location/walkthrough
The Weapons Card can be found on Tayari Plaza. After speaking to the Marine, there is a door on the left side of the adjacent ally that will automatically open upon your approach. Continue to move up as many flights of stairs as you can find. Soon, you will see several Brute and Elite corpses, which will trigger Buck's asking "What happened here?" The Superintendent will respond "Final notice, bill passed due!" Continue upwards; this should open to a balcony area with a dead Brute and a dead Elite. To the right of the Elite there should be the card. It is white, with black pictures of the weapons. There are other scraps of paper around them as well, but they are not legible and their contents not readily discernible.

Description
The card itself appears to have the outlines of several unknown weapons printed on it, clearly Covenant in origin. Upon further examination, it appears as though these weapons are pairs of Covenant weapons fused to one another. There are three identified so far. The first weapon is the second one down from the top left corner, which is a Beam Rifle-Covenant Carbine hybrid, the second, four down from top right corner, appears to be a plasma pistol- brute shot hybrid. And the third is a Needler-Plasma Rifle Combo.