TFTestkits reagent refills: no expiration date?

[MITBeta]

I received the following reagent refills from TFTestkits:

R-0013
R-0870
R-0871

None have expiration dates.

How do I know they are fresh? How do I know when to stop using them?

 

[mknauss]

Please email [email protected] for a response.

Thank you.