12 and wall 62 of second primary box 61 defines an additional or expanded accessory volume e for receiving additional accessories to be shipped together with the base component in order to accommodate both the base component and accessory box 10 in its expanded configuration second primary box 61 must be larger than first primary box 51 by approximately the expanded accessory volume e 0030 fig7 shows the preferred second retainer devices 71 associated with the second primary box 61 for helping to retain the extension members 21 22 and 23 in their extended position both while accessory box 10 is being filled in second primary box 61 and during shipping of the completed package the preferred second retainer devices 71 comprise slots formed in wall 62 of second primary box 61 each second retainer device slot 71 corresponds to one of the first retainer devices tabs 25 formed at the distal end of the respective accessory box extension members 21 22 and 23 when accessory box 10 in its expanded configuration is received in second primary box 61 as shown in fig6 each first retainer device tab 25 is received in a respective one of the second retainer devices slots 71 this cooperation between the tabs and slots combined with the snug fit between the received base component in volume b and accessory box 10 holds the accessory box in the proper position illustrated in fig6 0031 fig5 and 6 are necessarily diagrammatic and thus show a separation between for example the dashed box 52 and first primary box 51 in fig5 a similar separation is shown between the dashed box 52 and second primary box 61 in fig6 and between accessory.