BI4AVZ BG4TRF 4EG has stopped operating, and I have many contacts through his QSL card. Neither the official Chinese bureau has acknowledged it, nor am I actively trying to become its manager. If you are interested, please contact me to discuss further.
BH4GDU HAM, CQ, use left navigation, Chuncheng Post Office is the address.https://www.springcitypost.cn/zh-CN Although it's not BURO, it does provide forwarding services.
BG5EPM QEG.NET also offers forwarding services, which I think are quite useful. https://www.qeg.net.cn/register?invitation=BG5EPM