H1 Transfer approved. Not joining.

Hi
I work for employer A. Few months back i got offer from employer B and did H1B transfer.
Transfer got approved, but i declined to join and continued with employer A itself.
Now I hav offer with employer C and want o do transfer.
Do I need to the i797 from employer B as well for transfer or ignore it? Do i need to produce any oter documents?

My i797 with employer A is still valid

Do I need to the i797 from employer B as well for transfer or ignore it?

Ans: Ignore it

Do i need to produce any oter documents?

Ans: No

Is it true. i am also accepted for transfer but not willing to join now. Do i need to pay money for transfer