Client letter without client address / email / phone

My H1B petition from desi consultancy approved after RFE. Now its time to schedule for interview at Chennai consulate. But desi consultancy has provided me a client letter which has only client’s logo. No address/phone/fax/email/website is present. Is it ok to go for inerview with this client letter?

Wow. Is that letter even real? Does it has information on the person signing the letter, his designation, contact details?

Ask the employer to get a letter on client’s stationary and not use something that looks like made on his laptop.