I'm pretty sure you'd be a free agent by now. I recall a reporter/blogger/someone trying to declare themselves eligible and getting a letter back to the effect that since they were X years removed from high school, they were automatically eligible for a past draft and when they weren't drafted, became a free agent. I would imagine the # is you're automatically eligible 4 years after you graduate and can specifically declare after 3. I would imagine there's a list for people who declare early, not sure there's an exhaustive list of people 4 years removed from HS though.
I think you're right. Found this..-----Early entrants College football players who completed high school at least three years prior had until January 15, 2013, to declare their intention to forgo their remaining collegiate eligibility and enter the draft. Complete list of eligible underclassmen The following players were granted special eligibility to enter the 2013 draft: Keenan Allen, WR, California[1] David Amerson, CB, NC State[2] Alvin Bailey, G, Arkansas[3] Stedman Bailey, WR, West Virginia[4] David Bakhtiari, OT, Colorado[5] Dwayne Beckford, LB, Purdue[6] Le'Veon Bell, RB, Michigan State[7] Giovani Bernard, RB, North Carolina[8] Josh Boyce, WR, TCU[9] Tyler Bray, QB, Tennessee[10] Terrence Brown, CB Stanford[11] Duron Carter, WR, Florida Atlantic[12] Knile Davis, RB, Arkansas[13] Mike Edwards, CB, Hawaii[14] Tyler Eifert, TE, Notre Dame[15] Matt Elam, S, Florida[16] Zach Ertz, TE, Stanford[17] Gavin Escobar, TE, San Diego State[18] Chris Faulk, OT, LSU[19] Sharrif Floyd, DT, Florida[16] D. J. Fluker, OT, Alabama[20] Michael Ford, RB, LSU[21] Travis Frederick, C, Wisconsin[22] Kwame Geathers, DT, Georgia[23] William Gholston, DE, Michigan State[24] Johnathan Hankins, DT, Ohio State[25] Jajuan Harley, S, Middle Tennessee State[6] DeAndre Hopkins, WR, Clemson[26] Justin Hunter, WR, Tennessee[27] Jawan Jamison, RB, Rutgers[28] Stefphon Jefferson, RB, Nevada[29] Tony Jefferson, S, Oklahoma[30] Jelani Jenkins, LB, Florida[31] Luke Joeckel, OT, Texas A&M[32] Jarvis Jones, LB, Georgia[33] Bhaskar Ganti, NT, Pittsburgh[34] José José, DT, Central Florida[35] Brandon Kaufman, WR, Eastern Washington[36] Joe Kruger, DE, Utah[37] Eddie Lacy, RB, Alabama[20] Marcus Lattimore, RB, South Carolina[38] Corey Lemonier, DE, Auburn[39] Bennie Logan, DT, LSU[21] Stansly Maponga, DE, TCU[40] Tyrann Mathieu, DB, formerly LSU[41] Dee Milliner, CB, Alabama[20] Barkevious Mingo, DE, LSU[21] Kevin Minter, ILB LSU[42] Sam Montgomery, DE, LSU[21] Brandon Moore, DT, Texas[43] Damontre Moore, DE, Texas A&M[44] Alec Ogletree, LB, Georgia[45] Kyle Padron, QB, Eastern Washington[36] Cordarrelle Patterson, WR, Tennessee[46] Justin Pugh, OT, Syracuse[47] Bradley Randle, RB, UNLV[6] Joseph Randle, RB, Oklahoma State[48] Jordan Reed, TE, Florida[49] Eric Reid, S, LSU[50] Xavier Rhodes, CB, Florida State[51] Sheldon Richardson, DT, Missouri[52] Nickell Robey, CB, USC[53] Da'Rick Rogers, WR, Tennessee Tech[54] Logan Ryan, CB, Rutgers[55] Ace Sanders, WR, South Carolina[56] Darrington Sentimore, DE, Tennessee[57] Tharold Simon, CB, LSU[58] Dion Sims, TE, Michigan State[59] Akeem Spence, DT, Illinois[60] Kenny Stills, WR, Oklahoma[30] Levine Toilolo, TE, Stanford[61] Trabis Ward, RB, Tennessee State[62] Spencer Ware, RB, LSU[63] Menelik Watson, OT, Florida State[64] Björn Werner, DE, Florida State[65] Steve Williams, CB, California[66] Marquess Wilson, WR, Washington State[67] Brad Wing, P, LSU[68] Cierre Wood, RB, Notre Dame[69] Robert Woods, WR, USC[70] Tom Wort, LB, Oklahoma[71]