I can say that I sent the collective agreement and a sample contract for review without any problems. I also have tickets, EKTB, and a guarantee. I contacted sailors working there through LinkedIn, and they said that this is a normal practice in the company. Equisis also helped me.
Recently, the whole process was organized through email, but in the past, I signed contracts with other documents on the ship and everything was fine, although I had already worked several contracts with the company at that time. I wouldn't agree to go to a new company like that, but circumstances dictate everything.
I worked directly with the shipowner. I received the contract via email, signed it, and went on my way. There were no problems at all.