Does the Synology DiskStation DS223 come with pre-installed hard drives, or do I need to install them myself?

The Synology DiskStation DS223 comes with hard drives and memory upgrades included separately, not installed, so installation is required.

Questions & Answers: Synology DiskStation DS223 NAS Server with RTD1619B 1.7GHz CPU, 2GB Memory, 8TB HDD Storage, 1 x 1GbE LAN Port, DSM Operating System

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Synology DiskStation DS223 NAS Server with RTD1619B 1.7GHz CPU, 2GB Memory, 8TB HDD Storage, 1 x 1GbE LAN Port, DSM Operating System

Synology DiskStation DS223 is made for a variety of server roles, such as home data backup, file syncing, and sharing. A high-capacity powerhouse capable of fitting into most any environment, making it easy to centralize all your multimedia collections with rigorous workloads.
RTD1619B Quad-Core 1.7GHz CPU; 2GB DDR4 non-ECC; 8TB (2 x 4TB) SATA 3.5" HDDs for High-Capacity Storage; 1 x RJ-45 1GbE LAN Port (with Link Aggregation / Failover support); 3 x USB 3.2 Ports
Features: Security Advisor, Surveillance Station, Backup, Centralized Data Management, Ultra-Fast Data Transfer Speed, File Syncing and Sharing, Strong Application Support such as Multimedia Streaming, and Synology DSM Software Operating System
Synology NAS chassis comes in a sealed box.
Hard drives and memory upgrades included separately, not installed, installation required.