UCR的申请是必须要邮寄纸质的学位证明跟成绩单吗？

之前申请了UCR，今天才看到有这个specific requirement:
3. One official transcript – must be mailed

4. Certificate of Degree - International applicants only – must be mailed

想说官方成绩单好办，但是学位证我就一张啊，原件总不能寄给他们吧。
然后我还有一个英国master，成绩单都只有一份，找英国要的话猴年马月才能收到了，请问大家是怎么办的呢？
发邮件问小米得到的答复是这样的，他的意思是只需要邮寄成绩单或学位证就可以了吗？
另外看地里有人说这成绩单必须要学校官方寄或者盖学校章子，是这样吗？
Hello,
Please mail your transcript/certificate of degree to the following address:
Attn: Vanda Yamaguchi
Department of Computer Science and Engineering
Winston Chung Hall, Room 351
University of California
Riverside CA 92521, USA
Please mail it as soon as possible, as it will help with the processing of your application.

如果你成绩单上有注明获得的学位就不需要交Certificate of Degree