My university has shifted to a new location. I have a letter of recommendation in hardcopy form on old letterhead (i.e., with the old campus address) but with the current date. Moreover, my letter of recommendation does not have the referee's email and phone. The website is present on the letter but the university website also does not have the same email address from which my referee has sent an electronic email to my supervisor in their university abroad.
Is it necessary to have the contact details of the referee in the letter of recommendation? Can it affect my opportunity negatively?