I just checked on the N2 web site. I can transfer the credits to you - all I need is your member number and last name. If you want, you can give me a call 440-840-1427 or email my work email frank.loncar@averydennison.com
No, I do not believe that there are any restrictions, nor do they have an expiration date. I will email the N2 team and confirm - you can do the same if that is faster.