claiming missing points

[wendlle]

I took some United flights booked with Virgin and haven't got the points or SC on my account.
I have gone to do a missing points claim but have no idea of the first legs flight number.

Any ideas how to find this out?
I have my return info but not the first flight.

I have checked on the United and Virgin websites and this info can't be found.
I have the Virgin flight numbers but it wants a code starting with UA - I didn't keep my outgoing tickets which was a mistake I now see.

This is the info that I have

VA8000

Sydney (SYD) 11:50 Thu, Nov 10

Los Angeles (LAX) 06:40 Thu, Nov 10

 

[AIRwin]

I believe it's UA842

 

[wendlle]

I believe it's UA842

Thankyou I appreciate it

Now my next battle - getting one of my kids velocity accounts unlocked - for some reason the password isn’t working