Talk about bad timing. My mom just entered China via Hong Kong on Tuesday morning. She did a non-refundable PCR test before her flight from SFO on Saturday (site was closed Sunday), but then realized it would be over 48 hours by the time she reached the border crossing at Shenzhen. So she did another 2-hour PCR test at HKG upon just in case. Neither result were ever checked; Shenzhen border crossing is only randomly selecting people for tests 🙄