It turns out that the *star on the 516 in the Sync chart was a hot clue. The sync was with 470 and the *star meant that itwas a one-hop sync from earlier this year which turned out to be on the 470. Very nice! Here's the chart:
09/29/2020,470,821 | 03/13/2020,470,923 | 02/03/2004,470,671 -
09/30/2020,398,551 | 03/14/2020,651,740 | 02/04/2004,736,994
10/01/2020,761,596 | 03/15/2020,349,818 | 02/05/2004,700,254
10/02/2020,167,560 | 03/16/2020,061,221 | 02/06/2004,353,641
10/03/2020,406,190 | 03/17/2020,703,808 | 02/07/2004,320,337
10/04/2020,539,972 | 03/18/2020,950,870 | 02/09/2004,863,614
10/05/2020,611,820 | 03/19/2020,426,686 | 02/10/2004,108,681
10/06/2020,382,435 | 03/20/2020,144,777 | 02/11/2004,892,123
10/07/2020,934,230 | 03/21/2020,054,228 | 02/12/2004,372,776
10/08/2020,172,093 | 03/22/2020,634,565 | 02/13/2004,244,918
10/09/2020,501,542 | 03/23/2020,646,218 | 02/14/2004,308,381
10/10/2020,572,382 | 03/24/2020,096,811 | 02/16/2004,316,500
10/11/2020,934,142 | 03/25/2020,002,737 | 02/17/2004,727,737
10/12/2020,242,805 | 03/26/2020,294,299 | 02/18/2004,405,405
10/13/2020,408,790 | 03/27/2020,200,507 | 02/19/2004,171,494
10/14/2020,406,114 | 03/28/2020,532,655 | 02/20/2004,451,875
10/15/2020,443,928 | 03/29/2020,596,960 | 02/21/2004,196,339
10/16/2020,048,231 | 03/30/2020,434,775 | 02/23/2004,921,660
10/17/2020,205,227 | 03/31/2020,375,419 | 02/24/2004,063,021
10/18/2020,140,209 | 04/01/2020,316,976 | 02/25/2004,073,345
10/19/2020,322,689 | 04/02/2020,897,212 | 02/26/2004,570,378
10/20/2020,921,620 | 04/03/2020,263,709 | 02/27/2004,553,380
10/21/2020,572,554 | 04/04/2020,230,756 | 02/28/2004,909,134
10/22/2020,099,297 | 04/05/2020,369,201 | 03/01/2004,802,532
10/23/2020,043,793 | 04/06/2020,271,601 | 03/02/2004,208,104
10/24/2020,676,543 | 04/07/2020,091,648 | 03/03/2004,778,201
10/25/2020,092,761 | 04/08/2020,314,598 | 03/04/2004,308,476
10/26/2020,749,567 | 04/09/2020,241,314 | 03/05/2004,380,730
10/27/2020,394,477 | 04/10/2020,036,071 | 03/06/2004,025,092
10/28/2020,976,503 | 04/11/2020,992,865 | 03/08/2004,723,076
10/29/2020,391,265 | 04/12/2020,730,394 | 03/09/2004,645,098
10/30/2020,095,593 | 04/13/2020,115,258 | 03/10/2004,435,559
10/31/2020,516,??? | 04/14/2020,516,154 | 03/11/2004,516,394 -