i have checked both commands. Just AP serial is being returned
(Cisco Controller) >show ap inventory Marina-Out-WQ_AP2
NAME: "AP1560" , DESCR: "Cisco Aironet 1560 Series (IEEE 802.11ac) Access Point"
PID: AIR-AP1562E-E-K9, VID: V02, SN: FCZ2242Z0D8
(Cisco Controller) >show ap inventory all
Inventory for Marina-Out-WQ_AP2
NAME: "AP1560" , DESCR: "Cisco Aironet 1560 Series (IEEE 802.11ac) Access Point"
PID: AIR-AP1562E-E-K9, VID: V02, SN: FCZ2242Z0D8