Asking a buzurg to make dua for one

Q: Is it allowed to go to  a buzurg or a highly religious person who does a lot of ibadah and ask him to pray to Allah about my problem. And can we supplicate through an intermediary i.e through tawasul of a righteous one, living or dead e.g through Sheikh Abdul Qadir Jeelani. And I also want to know is it permissible for men and women to visit the shrines of say Sheikh Abdul Qadir Jeelani and other without committing any shirk and praying to Allah directly there?

Retrograde ejaculation

Q: Because of medication, I experience retrograde ejaculation. When I reach an orgasm during sleep (due to a dream), nothing comes out, since the sperm is redirected to the urinary bladder and comes out later, with the urine. Does such a "wet dream" necessitate ghusl even though it isn't wet in my case?

Items given to one from a warehousing company

Q: I do transport for a company that does packaging for various other companies. I do not know the details of their agreemants. I was given a bag of products from the company as they were moving warehouse. Also the balance of the products were returned to the companies for whom this company offers their services to. Can I use these products or is it better to return them?

Washing one's hands last

Q: We live in the same flat eat dinner together, one of the person among us, use to finish dinner late and wash his hands after all of us. Initially I felt like he is following sunnah but later he started doing it intentionally like he finished his dinner before all of us but still waits for all of us and even sometimes if he get up from dining, he don’t wash his hands until and unless we all washes ours. He roams around the house with those unwashed hands. We usually meet for dinner only and this person intentionally starts his dinner in last and washes his hands in last. i.e. after everyone. He is the first guy who sit on dining but still he waits for everyone. Couple of times, I told him to start the dinner, he didn’t, he used some tricks here and there but didn’t started and even same happened to wash the hands after dinner. I am
confused if this is his superstition or sunnah or what? It seems like me others also observed him but never discussed it, as it is quit silly but I feel uneasy joining with such person who has superstition or shirk. Please appreciate if you could spread some light on this activity and send
some rules of eating and ethics.