I didn't moisten my scalp for the first 3 days after the Hair Transplant procedure, did I dry my grafts out?

The short answer is no- you probably did not affect the grafts at all, but you may have increased your recovery time.After hair transplant, surgeons will recommend gently washing the area with water or saline to keep the area moist and prevent crusting. The grafts themselves, however, are receiving nutrients from the surrounding skin. While not following these instructions can lead to a build up of crusting and delayed healing, it is unlikely it would have a major affect on the viability of the grafts. You are 4 months out and often at least some of the grafts are in a temporary shock phase. Be patient, stay in close contact with your surgeon and give things time.

It is best to follow your doctor's advice over advice from the Internet. Don't follow advice from YouTube videos.  Follow your doctor's advice.

Thanks for your query. You did absolutely what was required to be done post hair transplant. Continuously using wet towel is not very required. Just keep applying Minoxidil and your hair transplant will be perfect. For even the slightest doubt you can still visit your treating doctor. Hope it helps.All The Best

If grafts are placed properly they won’t get dried out
and the hair wash is only to minimize the scabbing. Each hair transplant
physician may handle post op care slightly differently.   We recommend twice daily washing of both
donor and recipient areas up until day 5 after hair transplant.  We see our patients the day after surgery and
instruct them on the hair washing procedure using a sponge and a special
shampoo.  Patients are to wash their hair
twice a day for 4 days to help remove the crusts.  Do not rub either site, just dab the shampoo
to help moisten and loosen the crusts.  
You should be speaking with the physician that performed your
surgery.   Patients typically lose their
hair at 2-3 months but growth returns shortly thereafter at first as thin fine
hair but by 8 to 12 months the hair will thicken with full growth by 12
months.  Give it more time.

I suspect your grafts are intact.  I encourage patients to moisten the scalp simply to promote healing and help to expedite the healing.

Hair transplants with grow for about a month and then fall out and begin growing again a couple of months later. You probably did not cause them not to grow by what you did. 

An FUE is treated just like a regular hair transplant with regard to the recipient area, but the donor area has open wounds which require daily washing with soap and water. Within 3 days of surgery, you can resume full activities, heavy exercises if you wish. The recipient area requires daily washes as well to keep the recipient area free of crusts. I generally recommend the use of a sponge and supply my patient with a surgical sponge to fill with soapy water and press on the recipient area daily. By repeating this daily, all crusts can be washed off without any fear of losing grafts. IF any crust are present, use a Q tip and dip it into soapy water, and roll it on the crusts and that will lift them off without dislodging them, but never rub them, just roll the Q tip on the recipient crust. I like to see no evidence of any crusting in the recipient area and the crusts from the donor area gone in 7-10 days with daily washing.