Lost stock since migrating from desktop to online version

Hi I hope someone can help. I recently damaged the hard drive on my laptop and luckily had quickbooks desktop data backed up on a USB stick. I have now moved to the online version and had my data moved by movemybooks, but they have only moved the last 2 years out of 18. Unfortunately they could not move any of my stock and I wanted to know the best way to re-enter it without paying for it again? Any help is much appreciated, thanks Pete