Dear Ali,
Please check those issues:
1. In "1951-1990, Complete Proof Issues" (People's Republic of Bulgaria) set slots #123 "Figure Skating" and #127 "Winter Olympics" are same coins so one of them is unnecessary
2. In the same set slot #98 "1984 CU-NI SUMMER OLYMPICS 10L" there is not such a coin so the slot again is unnecessary
3. In "Silver 5 Leva, 2003-Date, Proof" (Republic of Bulgaria) slot #4 "2009 BULGARIA NATIONAL BANK - 130TH ANNIVERSARY" is actually a "10 leva coin" so the slot is unnecessary
4. Can you please add my coin 6631332-005 to slot #4 in Silver Gros, 1246-1397, Circulation Issue. (Second Bulgarian Empire)
Thank you in advance