这个商家有一个名称为“浙江嘉兴秀洲区申通公司”申通网点，商家后台查看到面单余量还有400多，但是接口返回的available为0，请问这是为什么？

【POST】请求url:https://api.weixin.qq.com/channels/ec/logistics/ewaybill/biz/account/get?access_token=97_LQpRQ-iZilvbyOO8nMlxQssth6IBGUeAop-

请求数据:{"limit":100,"need_balance":true,"offset":0,"status":3}

{"errcode":0,"errmsg":"ok","total_num":3,"account_list":[{"delivery_id":"DBKD","acct_type":0,"company_type":2,"shop_id":"5009836679237","acct_id":"6638152582","status":3,"available":0,"allocated":38,"recycled":0,"cancel":0,"monthly_card":"670570374","share":{},"sender_address":{"province":"浙江省","city":"嘉兴市","county":"南湖区","address":"凤桥镇新飞路332号"},"balance_retcode":0,"balance_retmsg":"OK","delivery_msg":""},{"delivery_id":"STO","acct_type":0,"company_type":1,"shop_id":"5009836679237","acct_id":"6637501952","status":3,"available":0,"allocated":0,"recycled":0,"cancel":0,"monthly_card":"","site_info":{"delivery_id":"STO","site_status":1,"site_code":"314000","site_name":"浙江嘉兴秀洲区申通公司","address":{"city_code":"330400000","city_name":"嘉兴市","detail_address":"元丰大道236号","district_code":"330411000","district_name":"秀洲区","province_code":"330000000","province_name":"浙江省","street_code":"","street_name":""},"contact":{"mobile":"13355735175","name":"唐有芬","phone":""},"site_fullname":"浙江嘉兴秀洲区申通公司"},"share":{},"sender_address":{"province":"浙江省","city":"嘉兴市","county":"南湖区","address":"凤桥镇新飞路332号"},"balance_retcode":0,"balance_retmsg":"OK"},{"delivery_id":"SF","acct_type":0,"company_type":2,"shop_id":"5009836679237","acct_id":"6638496328","status":3,"available":0,"allocated":19,"recycled":0,"cancel":0,"monthly_card":"5732452602","share":{},"sender_address":{"province":"浙江省","city":"嘉兴市","county":"南湖区","address":"凤桥镇新飞路332号"},"balance_retcode":0,"balance_retmsg":"OK","delivery_msg":""}]}