You're asking the same question in different words. I already said the answer is yes: you could have been injured by a needle and not been aware of it. But that doesn't mean it was likely. Almost certainly that did not happen.
That will end this thread. I will have no further comments or advice.
Dr HHH,
I got wounded in our office but that time i have meeting to my client so i just ignore it..
I dont know what was that wounded me.
So my question only.
if i got pricked by a syringe, it is possible to ignore the pain that cause by it or you just cannot ignore it?
Welcome to the forum.
No blood-borne virus (HIV, HBV, HCV) will survive in blood that has dried, certainly not after several days.
Can people be stuck by needles and not know it? Of course. All human beings discover cuts and nicks, sometimes even with significant bleeding, with no recollection of an injury themselves, especially when their mind is focused on something else. This is apparently what happened to you. But I see no reason to suppose it might have been a needle recently used by a person with a blood borne infection, especially if you don't have a visible wound of the sort made by a needle stick. If I were in your situation, I would assume it did not.
So the answers to your first 3 questions are 1) no, 2) no, 3) no risk, and 4) I doubt you suffered a needle injury.
Best wishes-- HHH, MD