The receiving IRA custodian is supposed to include in box 2 of From 5498 the value of the shares on the date they are placed in the IRA. The instructions for Form 5498 say:
For the rollover of property, enter the FMV of the property on the date you receive it. This value may be different from the value of the property on the date it was distributed to the participant.
The only time this might be a problem for the custodian is if the shares do not have a readily ascertainable value.
