Welcome back to the Forum. To expand on my earlier comments, STDs are almost never transmitted through mutual masturbation. I'll work through your questions but to give you the "bottom line" first, in the absence of genital symptoms, there is no reason for you to worry about any STD.
1. What are the chances of catching warts and/ or herpes from genital to hand to genital contact?
Both of these infections are transmitted by direct contact, not by the movement of viruses from one person to another on the hands. Virtually no risk.
2. Years ago I had warts on my anus but nothing since. Could this recent contact start the onset of another outbreak?
No concerns. Masturbation would not "stir up" infection from long ago at another site. If your anal warts have been taken care of they should not recur.
3. If I have caught any STDs from this contact when would I expect to see symptoms?
Yes. I you do not develop symptoms, and I am confident that you will not, you need not worry and do not need testing.
4. Do you believe that from the contact described it would be safe for me to have sex with my wife?
Yes, I would say it is safe to have unprotected contact with your wife.
I hope these comments help. EWH
Still no risk. Working on your guilt and trying to not worry so much is the best thing you could do. EWH
Thanks for the information. I now remember fingering the guy's anus although I did not put my finger inside - just stimulated the entrance. I know there is know significant risk of this activity as such but on one of my fingers (possibly the one I used - I can't remember) I have some broken skin. It was not cut nor bleeding at the time of the incident but quite pink due to my bad habit of nailbiting. Quite often it goes red if the skin is broken but at the moment it is ok. I was wondering if there was a risk there fro any STD.
Again, I understand that it is probably my guilt ruling my anxiety but I need to know whethere or not it is worth getting tested.
Thanks