Hello,
Do you have a precise reason to search F-5/6 losses in this precise date over Yugoslavia ? I have nothing for this time and area, only a RAF Mustang III lost on the 16th (of 213 Sqn, pilot returned some days later), but an US aircraft may be lost here in partisan or liberated territory without any trace in MACR, so only unit diaries may prove there was no loss.
An useful website if you don't know it: a list of the air losses over Yugoslavia 43-45
http://mysite.wanadoo-members.co.uk/...ses/losses.htm