The fair market value of an HSA is found in box 5 of form 5498-SA, which the HSA custodian mails to you.
The problem is that the 5498-SA is not required to be mailed to you until May, so your wife may not have gotten it yet (HSA custodians are all over the place on when they mail this form).
The solution, then, is to just call your HSA custodian and ask them. Actually, the form or the equivalent information may be available at your HSA custodian's website.
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