I interpret it as:
"The worker is only accredited the allocated company stock on leaving the company."
Virgin - Unused, untouched, unadulterated
"virgin packaging waste" - Probably refers to unused packaging produced that does not pass the quality controls.
A virgin CD.
Virgin olive oil.
A virgin CD
2. An eco-efficiency program ... cut the company's manufacturing waste by half and reduced virgin packaging waste by 25%...
Student or Learner