I'm ego 1950~, and I had 4orange. All of them useless, and 2 infectors (the same).
I opened only t3 lockboxes, except for a t4 in the beginning, and the free ones from DLC pass etc...
That's because they have a higher orange drop rate.
However, in the long run, you'll have more chance if you open t3 lockbox, considering they have the best droprate/key ratio.

