Can hpv infect the interstitial cells of the testicle or internal epithelium? i have papillomas around my surgical wound from an orchiectomy.

Probably not: To my knowledge, HPV isn't known to cause infections of these cells or tissues. Were warts (papillomas) confirmed by your doctor, or your self diagnosis? Things other than warts seem more likely to cause growths on or near a surgical wound, especially keloids, a kind of hypertrophic scar tissue, most common in dark-skinned persons. I doubt you need be concerned, but discuss with your doctor.