Alan, I found the entry regarding the mailbag falling out of the chopper:

1625 hours 6 April '69: C Co 1/35 reports a bird came out with package mail which we requested not to bring out. So we put the package mail back on the chopper and the mailbag fell out at approximatley 2 to 3 clicks from our location enroute back to LZ English.

From the 2 June '69 journal:

1920 hours From B Co 1/35 CO to S-3: Like to know the status on E-7 who fell out of the chopper yesterday at my location.