1. For parcel RF258010259CN, this is the full tracking:
Parcel No.RF258010259CN tracking result
2016-05-25 09:26:08.0 Electronic Data Received
2016-05-26 16:38:06.0 parcel center received
2016-05-26 20:44:34.0 parcel center customs scan
2016-05-26 23:22:21.0 leaving parcel center ，next station Shenzhen center
2016-05-27 01:28:16.0 Shenzhen Transit Station export security scan
2016-05-27 14:17:59.0 Shenzhen Transit Station export customs scan (domestic transit )
2016-05-29 14:04:42.0 Guangzhou Transit Station export security scan
2016-05-29 14:51:03.0 Guangzhou Transit Station export customs cleared
2016-05-29 14:51:03.0 Guangzhou Transit Station export customs cleared
2016-05-30 09:28:17.0 Guangzhou express 公司 safety check rejected
2016-05-30 20:33:00.0 arrive Guangzhou Airport
2016-05-30 20:40:42.0 leaving Guangzhou Airport going to next airport/seaport
2016-06-01 23:52:00.0 arrive Guangzhou Airport
2016-06-01 23:55:49.0 leaving Guangzhou Airport going to next airport/seaport
2016-06-29 14:17:24.0 Guangzhou Transit Station import customs scan ,remark (rejected )
2016-06-30 10:34:15.0 Guangzhou Transit Station import customs cleared (domestic transit )
2016-07-02 09:47:47.0 Shenzhen Transit Station import customs scan
2016-07-02 11:23:16.0 Shenzhen Transit Station import customs cleared (domestic transit )

2. Your parcel on:
2016-05-30 09:28:17.0 Guangzhou express 公司 safety check rejected

Was refuse by the Airline security check.
Then the parcel stayed (or maybe even went to Bulgaria but was refuse entry and sent back to Guangzhou) at the Airport and probably forgotten in a corner somewhere until here:
2016-06-29 14:17:24.0 Guangzhou Transit Station import customs scan ,remark (rejected )

Then parcel following the return trip to seller but so far did not make it there yet because of the last tracking:
2016-07-02 11:23:16.0 Shenzhen Transit Station import customs cleared (domestic transit )

3. You should contact seller about this parcel so he can call China Post Hot Line: 11185, to find out where is the parcel at right now. Please provide him with the full scan I gave you so he understand what you are talking about. Try to come with an arrangement with the seller.

4. for parcel RF258167906CN, this is the full tracking:
Parcel No.RF258167906CN tracking result
2016-05-25 10:46:31.0 Electronic Data Received
2016-05-26 22:01:32.0 parcel center received
2016-05-26 22:41:52.0 parcel center customs scan
2016-05-26 23:22:21.0 leaving parcel center ，next station Shenzhen center
2016-05-27 01:29:47.0 Shenzhen Transit Station export security scan
2016-05-27 13:39:19.0 Shenzhen Transit Station export customs scan (domestic transit )
2016-05-29 14:02:24.0 Guangzhou Transit Station export security scan
2016-05-29 14:51:03.0 Guangzhou Transit Station export customs cleared
2016-05-29 14:51:03.0 Guangzhou Transit Station export customs cleared
2016-05-30 09:28:17.0 Guangzhou express 公司 safety check rejected
2016-05-30 20:33:00.0 arrive Guangzhou Airport
2016-05-30 20:40:42.0 leaving Guangzhou Airport going to next airport/seaport
2016-06-01 23:52:00.0 arrive Guangzhou Airport
2016-06-01 23:55:49.0 leaving Guangzhou Airport going to next airport/seaport
2016-06-29 14:19:22.0 Guangzhou Transit Station import customs scan ,remark (rejected )
2016-06-30 10:20:00.0 Guangzhou Transit Station import customs cleared (domestic transit )
2016-07-02 09:31:37.0 Shenzhen Transit Station import customs scan
2016-07-02 15:30:01.0 Shenzhen Transit Station import customs cleared (domestic transit )

5. Same comments apply to this parcel as the above one.

Hope this help.