In most years the Supplemental draft is even more uneventful than the MLB draft. This was one of those years. While the regular NFL draft has insane levels of lead-up and analysis with the day itself being a primetime, three day event, the Supplemental draft happened like this:
The Supplemental draft is today... The supplemental draft has begun and is over with no players selected. Not even a Mr Irrelevant.
If a team were to take a player in the Supplemental Draft, they would then not have a selection in the same round in the following year's draft. When the Raiders took Pryor in the third round of the third round of the 2011 Supplemental Draft, they had no third round pick in the 2012 draft.
There were four players eligible for the draft today. One of whom was Virginia-Lynchburg defensive tackle prospect Lakendrick Ross who came in at 6-4, 366 pounds. The Raiders were onhand for his workout along with 10 other teams and all of them didn't see a draftable player.
The other three were New Mexico WR Chase Clayton, North Carolina LB Darius Lipford, and SMU RB Traylon Shead. You can read more about them here.
Teams may now sign them as undrafted free agents if they like.