H1B transfer 当前雇主的问题

我目前在一家ICC做contractor，一直挣扎着想跳出这个坑，前段时间终于接到一个SDE的offer，深感不易。
现在我在准备H1B transfer，但有一个问题让我寝食难安：当时公司在给我申H1B时要我提供了client/vendor letter，目的是解释Employer - Employee Relationship （很多icc/staffing company 用Employer - Client 或 Employer -Vendor - Client模式申H1B）我的H1B也顺利approve。此后，我又在另外两家Client公司工作过。但现在由于种种原因没法要到那两家的Client letter。


我担心的是我的H1B transfer会不会因此被RFE呢？比如USCIC会不会要求解释当前工作如何maintaining lawful H-1B status，或者employer-employee relationship是否legitimate？


我目前收集到的信息是：USCIS typically places more emphasis on the new job offer and the employer-employee relationship with the prospective employer. However, the absence of client/vendor letters might prompt USCIS to inquire further about your employment history and the nature of your projects during the period covered by those documents.


处理我case的律师始终不回邮件，唉。在此求助各位，有没有好的意见，经验？ 感恩！🙏🏻